Warning devices — Utah Permit Test

Warning devices must be displayed whenever a Utah vehicle at least 80 inches wide or 30 feet long is disabled or stopped along the road for more than 10 minutes.

Ten minutes is long enough for a stopped vehicle to become something nobody expects, and a large one blocks a lane.

Warning devices must be displayed whenever your vehicle is at least 80 inches wide or 30 feet long and is disabled or stopped along the road for more than 10 minutes.

A Utah driver should place flares, electric lights, or reflectors 100 feet to the front and rear of a disabled vehicle.

A hundred feet either way is what turns a surprise into a warning for traffic coming from both directions.

Next, place flares, electric lights, or reflectors 100 feet to the front and rear of the vehicle.

On a Utah one-way street the rear flag should be placed 200 feet to the rear of the disabled vehicle.

On a one-way street everything arrives from behind at speed, so the warning is set twice as far back.

On a one-way street, the rear flag should be placed 200 feet to the rear.

Where a Utah vehicle breaks down within 500 feet of a curve or hilltop that obstructs the view, the warning device in that direction may be placed no more than 500 feet and no closer than 100 feet from the vehicle.

Behind a blind crest the usual hundred feet is useless, so the device moves back as far as the rule allows.

The warning device; however, may not be placed more than 500 feet away from the vehicle no closer than 100 feet to the vehicle.

Utah warning devices need not be displayed if sufficient light reveals persons or vehicles from 1,000 feet.

Under good street lighting the car is already visible from further than a flare would reach.

Warning devices need not be displayed if sufficient light reveals persons or vehicles from 1,000 feet.

All Utah warning devices must be placed in the center of the lane the vehicle is stopped in, or on the shoulder as close as possible to the road surface where the vehicle is entirely off the road.

A flare at the roadside warns nobody. In the middle of the lane it is in front of the driver who needs it.

All warning devices must be placed in the center of the lane in which your vehicle is stopped.

Flares and fuses may not be carried in Utah vehicles transporting explosives, flammable liquids, or compressed gas.

A burning flare beside a tank of fuel is the one place the warning device is worse than the breakdown.

REMEMBER, FLARES AND FUSES MAY NOT BE CARRIED IN VEHICLES TRANSPORTING EXPLOSIVES, FLAMMABLE LIQUIDS OR COMPRESSED GAS.

A Utah driver may not attach a flare or fuse to their vehicle, which is both hazardous and illegal.

A flare burns hot enough to set the paint alight, and it is the vehicle you were trying to protect.

Do not attach any flare or fuse to your vehicle. Not only is this a hazardous action, but it is also illegal.

After how long must a stopped large Utah vehicle display warning devices?

10 minutes. Ten minutes is long enough for a stopped vehicle to become something nobody expects, and a large one blocks a lane. Utah Driver Handbook 2026-2027, p.93: “Warning devices must be displayed whenever your vehicle is at least 80 inches wide or 30 feet long and is disabled or stopped along the road for more than 10 minutes.”